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Abstract

We consider the planning problem of a flexible optical network. Given the traffic
matrix and the transponders’ feasible configurations that account for the
physical layer, we formulate the planning problem considering both the use or
not of regenerators. Demands are served for their requested rates by choosing
the route, selecting the transmission configuration, breaking the transmissions
in more than one connection and placing regenerators, if needed, and allocating
the spectrum to them. The objective is to serve the traffic and find a solution
that is Pareto optimal with respect to the maximum spectrum used and the cost
(number and type) of transponders used. The problem definition and the proposed
algorithms are general and applicable to flex-grid as well as fixed-grid
networks. We start by presenting algorithms based on integer linear programming
formulations for transparent and translucent networks (without or with
regenerators) and we continue by presenting heuristic algorithms. Using input
driven by transmission studies on optical orthogonal frequency-division
multiplexing (OFDM)-based networks we evaluate the performance gains that can be
obtained by an OFDM over a mixed line rate fixed-grid WDM optical network.

References

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